Chapter 7 ______________________________________________Troubleshooting
VAISALA__________________________________________________________53
Indications
Table 9 Indication Messages
Indication
Messages
Probable Cause Remedy
If operated only with battery or
DC power, set the hood heater
OFF to prevent this warning
If installed into an FS11 system,
check that the yellow LED is lit
on the interface unit power
supply board FSP101. If it is
not, check the fuse.
HOOD HEATER
FAULT
Hood heater not
operational. Hood
temperature has increased
less than 2 °C within the 5
minutes since the heater
was turned on by the
automatic heater control
circuit.
Check the heating foils visually.
If there is a black burned area
on the surface, the LM211244
unit must be replaced. Contact
Vaisala. - Check the hood
temperature from the status
message to see if there is a
hood heater temperature
sensor failure. In case the hood
temperature is showing
irrelevant or missing (/////)
values, there is a temperature
sensor failure and the
LM211244 unit must be
replaced. Contact Vaisala.
DEW HEATER
FAULT
Dew heater not operational.
No current runs through the
heater element when it is
on.
Open the LM21 cover and
check the connectors of the
dew heater resistor cables. If
this does not help, replace the
LMM101 assembly.
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